Mitation marble from paper



(ModeL) S. H. HAMILTON.

IMITATION MARBLE FROM PAPER. NO. 269,817. Patented Deo.Z6,1882.

UNITED STATES PATENT OFFICE.

SILAS H. HAMILTON, OF BUSHNELL, ASSIGNOR, BY MESNE ASSIGNMENTS,

. TO MARVIN A. FARR, OF CHICAGO, ILLINOIS.

lMITATlON MARBLE FROM PAPER.

SPECIFICATION formingpart of Letters Patent No. 269,817, dated December 26, 1882,

Application filed August 14, 1878. Renewed October 94, 1881.

To all whom it may concern Be it known that 1, SILAS H. HAMILTON, of Bushnell, in the county ofMcDonough, and in the State oflllinois, have invented certain new and useful Improvements in'Imitation Marble; and 1 do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l is a perspective view of a slab of paper marbleized, and Fig. 2 is a cross-section of the same. v

Letters of like name and kind refer to like I5 parts in each of the figures.

In consequence of the greater hardness of surface and the ability toresist the action of acids, slate or low-grade marble having an artificial or marbleized surface have to a great extent superseded fine marble in the construction of mantels'; but such artificialsurt'aced articles have always been open to the objection that if any portion of such surface became broken or in other manner injured 2 the exposed portion of the base would present a difif'erent appearance and at once expose the artificial character of themarble represented. Such injury is especially liable to occur while mantels are being shipped and set up, and ma- 0 terially lessens the value of marbleized work.

To obviate this objection and enable the production of an article that is cheaper, more durable, and has less weight is the design of my invention, which consists, as a new article of manufacture, in artificial marble composed of a paper base or body and having its surface marbleized, substantially as and for the purpose herein specified.

In the production of my artificial marble I 40 employ slabs which are made in the followingnianner: To one and one-half ton of paper-pulp I add a solution composed of fortynine pounds ofglue, one and one-eighth pound of bichromate of potash, fifty pounds of alum,

5 and two pounds of soluble glass or other silicate, which solution is thoroughly mixed with said paper-pulp, and the composition then iModel.)

made into sheets A by any ordinary papermaking machinery, said sheets being, however, subjected to more than ordinary pressure between rollers, so as to give to them great density. .Two or more of the sheets A are now coated exteriorly with the solution named and placed with their faces in contact, after which they are passed between pressure-rollers, so 5 5 as to cause their faces to become firmly united and the whole to be practically homogeneous. Thealum andsilicatc render the slab fire-proof, so that it is able to withstand the heat necessary during the marbleizing process, which latter is the same as ordinarily employed in marbleizing slate. The artificial marble thus formed has about the weight of poplar wood, is far more tough and durable than slate, and cannot be dented or otherwise injured by any ordinary use, while nothing less than extreme violence can cause breakage or bending of a slab.

ployed 1 do not confine myself to the same.

Having thus fully set forth the nature and merits of my invention, what I claim is- As a new article of manufacture, artificial marble composedot' a paper base or body having'its surface uiarbleized, substantially as as and for the purpose specified.

In testimony that I claim the foregoing I have hereunto set my hand this 13th day-of August, 1878.

SILAS H. HAMILTON.

Witnesses:

HARTFORD P. BROWN, GEORGE S. PRINDLE. 

